US3847994A - 2,2-dimethyl-5-(aryloxy)-valeraldehydes - Google Patents
2,2-dimethyl-5-(aryloxy)-valeraldehydes Download PDFInfo
- Publication number
- US3847994A US3847994A US00283864A US28386472A US3847994A US 3847994 A US3847994 A US 3847994A US 00283864 A US00283864 A US 00283864A US 28386472 A US28386472 A US 28386472A US 3847994 A US3847994 A US 3847994A
- Authority
- US
- United States
- Prior art keywords
- dimethyl
- xylyloxy
- acid
- reaction
- mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 150000001875 compounds Chemical class 0.000 claims abstract description 29
- 239000001257 hydrogen Substances 0.000 abstract description 6
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical group [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- UHOVQNZJYSORNB-UHFFFAOYSA-N benzene Substances C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 abstract 1
- WCYWZMWISLQXQU-UHFFFAOYSA-N methyl Chemical group [CH3] WCYWZMWISLQXQU-UHFFFAOYSA-N 0.000 abstract 1
- -1 2,2-dimethyl-5-(3,5-xylyloxy)valeraldehyde Chemical compound 0.000 description 42
- 239000000203 mixture Substances 0.000 description 29
- 238000006243 chemical reaction Methods 0.000 description 26
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 24
- 239000000047 product Substances 0.000 description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 22
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 18
- 239000002904 solvent Substances 0.000 description 18
- 239000000243 solution Substances 0.000 description 16
- UAOMVDZJSHZZME-UHFFFAOYSA-N diisopropylamine Chemical compound CC(C)NC(C)C UAOMVDZJSHZZME-UHFFFAOYSA-N 0.000 description 15
- 238000000034 method Methods 0.000 description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 12
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 12
- 230000009467 reduction Effects 0.000 description 11
- 238000010992 reflux Methods 0.000 description 11
- 239000002585 base Substances 0.000 description 10
- KQNPFQTWMSNSAP-UHFFFAOYSA-N isobutyric acid Chemical compound CC(C)C(O)=O KQNPFQTWMSNSAP-UHFFFAOYSA-N 0.000 description 10
- 239000012280 lithium aluminium hydride Substances 0.000 description 10
- 210000002966 serum Anatomy 0.000 description 10
- 239000004215 Carbon black (E152) Substances 0.000 description 9
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 150000002148 esters Chemical class 0.000 description 9
- 229930195733 hydrocarbon Natural products 0.000 description 9
- DRFYEIPEKLGMKO-UHFFFAOYSA-N 2-(3-bromopropoxy)-1,4-dimethylbenzene Chemical compound CC1=CC=C(C)C(OCCCBr)=C1 DRFYEIPEKLGMKO-UHFFFAOYSA-N 0.000 description 8
- CNNHXZWDFFITJQ-UHFFFAOYSA-N 5-(2,5-dimethylphenoxy)-2,2-dimethylpentan-1-ol Chemical compound CC1=CC=C(C)C(OCCCC(C)(C)CO)=C1 CNNHXZWDFFITJQ-UHFFFAOYSA-N 0.000 description 8
- 239000002253 acid Substances 0.000 description 8
- 230000003301 hydrolyzing effect Effects 0.000 description 8
- ZCSHNCUQKCANBX-UHFFFAOYSA-N lithium diisopropylamide Chemical compound [Li+].CC(C)[N-]C(C)C ZCSHNCUQKCANBX-UHFFFAOYSA-N 0.000 description 8
- 238000000746 purification Methods 0.000 description 8
- 239000000376 reactant Substances 0.000 description 8
- 239000007858 starting material Substances 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 229910052783 alkali metal Inorganic materials 0.000 description 7
- 125000004432 carbon atom Chemical group C* 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 7
- 150000003626 triacylglycerols Chemical class 0.000 description 7
- FGTRKEKWAVDNIK-UHFFFAOYSA-N 1-(3-bromopropoxy)-3,5-dimethylbenzene Chemical compound CC1=CC(C)=CC(OCCCBr)=C1 FGTRKEKWAVDNIK-UHFFFAOYSA-N 0.000 description 6
- KPVJSUZOTMDHCK-UHFFFAOYSA-N 5-(3,5-dimethylphenoxy)-2,2-dimethylpentan-1-ol Chemical compound CC1=CC(C)=CC(OCCCC(C)(C)CO)=C1 KPVJSUZOTMDHCK-UHFFFAOYSA-N 0.000 description 6
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 6
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 6
- 150000001340 alkali metals Chemical class 0.000 description 6
- 239000000706 filtrate Substances 0.000 description 6
- 150000004820 halides Chemical class 0.000 description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 6
- 241001465754 Metazoa Species 0.000 description 5
- 229940043279 diisopropylamine Drugs 0.000 description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 5
- 239000012074 organic phase Substances 0.000 description 5
- JOXIMZWYDAKGHI-UHFFFAOYSA-N p-toluenesulfonic acid Substances CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 5
- 239000012279 sodium borohydride Substances 0.000 description 5
- 229910000033 sodium borohydride Inorganic materials 0.000 description 5
- 238000006467 substitution reaction Methods 0.000 description 5
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 4
- 229910052987 metal hydride Inorganic materials 0.000 description 4
- 150000004681 metal hydrides Chemical class 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 229910000104 sodium hydride Inorganic materials 0.000 description 4
- 239000012312 sodium hydride Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- HEMJJKBWTPKOJG-UHFFFAOYSA-N Gemfibrozil Chemical compound CC1=CC=C(C)C(OCCCC(C)(C)C(O)=O)=C1 HEMJJKBWTPKOJG-UHFFFAOYSA-N 0.000 description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 239000008346 aqueous phase Substances 0.000 description 3
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- HVYWMOMLDIMFJA-DPAQBDIFSA-N cholesterol Chemical compound C1C=C2C[C@@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2 HVYWMOMLDIMFJA-DPAQBDIFSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012259 ether extract Substances 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 150000002367 halogens Chemical group 0.000 description 3
- 150000002466 imines Chemical class 0.000 description 3
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- UFTFJSFQGQCHQW-UHFFFAOYSA-N triformin Chemical compound O=COCC(OC=O)COC=O UFTFJSFQGQCHQW-UHFFFAOYSA-N 0.000 description 3
- SQOCMJABJNFDTN-UHFFFAOYSA-N 5-(3,5-dimethylphenoxy)-2,2-dimethylpentanoic acid Chemical compound CC1=CC(C)=CC(OCCCC(C)(C)C(O)=O)=C1 SQOCMJABJNFDTN-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 241000700159 Rattus Species 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 150000008065 acid anhydrides Chemical class 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 239000002168 alkylating agent Substances 0.000 description 2
- 229940100198 alkylating agent Drugs 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 150000001733 carboxylic acid esters Chemical class 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 125000004093 cyano group Chemical group *C#N 0.000 description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 125000002485 formyl group Chemical group [H]C(*)=O 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- LRDFRRGEGBBSRN-UHFFFAOYSA-N isobutyronitrile Chemical compound CC(C)C#N LRDFRRGEGBBSRN-UHFFFAOYSA-N 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- KJIFKLIQANRMOU-UHFFFAOYSA-N oxidanium;4-methylbenzenesulfonate Chemical compound O.CC1=CC=C(S(O)(=O)=O)C=C1 KJIFKLIQANRMOU-UHFFFAOYSA-N 0.000 description 2
- HGBOYTHUEUWSSQ-UHFFFAOYSA-N pentanal Chemical compound CCCCC=O HGBOYTHUEUWSSQ-UHFFFAOYSA-N 0.000 description 2
- DGTNSSLYPYDJGL-UHFFFAOYSA-N phenyl isocyanate Chemical compound O=C=NC1=CC=CC=C1 DGTNSSLYPYDJGL-UHFFFAOYSA-N 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 150000003512 tertiary amines Chemical group 0.000 description 2
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 1
- VFWCMGCRMGJXDK-UHFFFAOYSA-N 1-chlorobutane Chemical compound CCCCCl VFWCMGCRMGJXDK-UHFFFAOYSA-N 0.000 description 1
- ZTNYBWKPABUDNH-UHFFFAOYSA-N 2-(2,5-dimethylphenoxy)-1,4-dimethylbenzene Chemical compound CC1=CC=C(C)C(OC=2C(=CC=C(C)C=2)C)=C1 ZTNYBWKPABUDNH-UHFFFAOYSA-N 0.000 description 1
- NAMYKGVDVNBCFQ-UHFFFAOYSA-N 2-bromopropane Chemical compound CC(C)Br NAMYKGVDVNBCFQ-UHFFFAOYSA-N 0.000 description 1
- RTNMIFICVHTRBJ-UHFFFAOYSA-N 5-(3,5-dimethylphenoxy)-2,2-dimethylpentanenitrile Chemical group CC1=CC(C)=CC(OCCCC(C)(C)C#N)=C1 RTNMIFICVHTRBJ-UHFFFAOYSA-N 0.000 description 1
- 239000005711 Benzoic acid Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 1
- DHXVGJBLRPWPCS-UHFFFAOYSA-N Tetrahydropyran Chemical compound C1CCOCC1 DHXVGJBLRPWPCS-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 229910000102 alkali metal hydride Inorganic materials 0.000 description 1
- 150000008046 alkali metal hydrides Chemical class 0.000 description 1
- 150000004703 alkoxides Chemical group 0.000 description 1
- 125000005907 alkyl ester group Chemical group 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminum chloride Substances Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 1
- 150000001408 amides Chemical group 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 235000010233 benzoic acid Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- RDHPKYGYEGBMSE-UHFFFAOYSA-N bromoethane Chemical compound CCBr RDHPKYGYEGBMSE-UHFFFAOYSA-N 0.000 description 1
- KMGBZBJJOKUPIA-UHFFFAOYSA-N butyl iodide Chemical compound CCCCI KMGBZBJJOKUPIA-UHFFFAOYSA-N 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- NKDDWNXOKDWJAK-UHFFFAOYSA-N dimethoxymethane Chemical compound COCOC NKDDWNXOKDWJAK-UHFFFAOYSA-N 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- VAYGXNSJCAHWJZ-UHFFFAOYSA-N dimethyl sulfate Chemical compound COS(=O)(=O)OC VAYGXNSJCAHWJZ-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- FPIQZBQZKBKLEI-UHFFFAOYSA-N ethyl 1-[[2-chloroethyl(nitroso)carbamoyl]amino]cyclohexane-1-carboxylate Chemical compound ClCCN(N=O)C(=O)NC1(C(=O)OCC)CCCCC1 FPIQZBQZKBKLEI-UHFFFAOYSA-N 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- GNOIPBMMFNIUFM-UHFFFAOYSA-N hexamethylphosphoric triamide Chemical compound CN(C)P(=O)(N(C)C)N(C)C GNOIPBMMFNIUFM-UHFFFAOYSA-N 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- HVTICUPFWKNHNG-UHFFFAOYSA-N iodoethane Chemical compound CCI HVTICUPFWKNHNG-UHFFFAOYSA-N 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- DLEDOFVPSDKWEF-UHFFFAOYSA-N lithium butane Chemical compound [Li+].CCC[CH2-] DLEDOFVPSDKWEF-UHFFFAOYSA-N 0.000 description 1
- 229910000103 lithium hydride Inorganic materials 0.000 description 1
- AHNJTQYTRPXLLG-UHFFFAOYSA-N lithium;diethylazanide Chemical compound [Li+].CC[N-]CC AHNJTQYTRPXLLG-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- VDUQUWCVENWCNL-UHFFFAOYSA-L magnesium;2-methylpropanoate Chemical compound [Mg+2].CC(C)C([O-])=O.CC(C)C([O-])=O VDUQUWCVENWCNL-UHFFFAOYSA-L 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VUQUOGPMUUJORT-UHFFFAOYSA-N methyl 4-methylbenzenesulfonate Chemical compound COS(=O)(=O)C1=CC=C(C)C=C1 VUQUOGPMUUJORT-UHFFFAOYSA-N 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- JCJVGEYCNKQCQC-UHFFFAOYSA-N n-cyclohexyl-2-methylpropan-1-imine Chemical compound CC(C)C=NC1CCCCC1 JCJVGEYCNKQCQC-UHFFFAOYSA-N 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 125000005489 p-toluenesulfonic acid group Chemical group 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 235000021401 pellet diet Nutrition 0.000 description 1
- 239000002831 pharmacologic agent Substances 0.000 description 1
- NHKJPPKXDNZFBJ-UHFFFAOYSA-N phenyllithium Chemical compound [Li]C1=CC=CC=C1 NHKJPPKXDNZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- ODZPKZBBUMBTMG-UHFFFAOYSA-N sodium amide Chemical compound [NH2-].[Na+] ODZPKZBBUMBTMG-UHFFFAOYSA-N 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- TWEGKFXBDXYJIU-UHFFFAOYSA-M sodium;2-methylpropanoate Chemical compound [Na+].CC(C)C([O-])=O TWEGKFXBDXYJIU-UHFFFAOYSA-M 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 150000003511 tertiary amides Chemical class 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C47/00—Compounds having —CHO groups
- C07C47/20—Unsaturated compounds having —CHO groups bound to acyclic carbon atoms
- C07C47/277—Unsaturated compounds having —CHO groups bound to acyclic carbon atoms containing ether groups, groups, groups, or groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/51—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition
- C07C45/516—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition involving transformation of nitrogen-containing compounds to >C = O groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C59/00—Compounds having carboxyl groups bound to acyclic carbon atoms and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups
- C07C59/40—Unsaturated compounds
- C07C59/58—Unsaturated compounds containing ether groups, groups, groups, or groups
- C07C59/64—Unsaturated compounds containing ether groups, groups, groups, or groups containing six-membered aromatic rings
- C07C59/66—Unsaturated compounds containing ether groups, groups, groups, or groups containing six-membered aromatic rings the non-carboxylic part of the ether containing six-membered aromatic rings
- C07C59/68—Unsaturated compounds containing ether groups, groups, groups, or groups containing six-membered aromatic rings the non-carboxylic part of the ether containing six-membered aromatic rings the oxygen atom of the ether group being bound to a non-condensed six-membered aromatic ring
Definitions
- the present invention relates to new 2,2-dimethyl-5- aryloxypentane compounds. More particularly, the invention relates to new compounds of the formula and to methods for their production.
- one of R and R represents hydrogen; the other of R and R represents methyl; and Y represents cyano (CN), formyl (-CHO), or a group of the formula CH OR in which R represents hydrogen, lower alkyl, an acyl radical of a hydrocarbon carboxylic acid containing not more than 7 carbon atoms, or phenylcarbamoyl
- R represents lower alkyl, it is a lower alkyl radical of preferably not more than 4 carbon atoms and is most suitably methyl.
- the carbinols of the invention that is, the compounds wherein Y represents I CH2OR and R represents hydrogen
- a compound of the formula can be produced by reacting a compound of the formula with a reducing agent; where R and R are as defined before and R represents hydrogen, a salt-forming cation, or a lower alkyl radical of preferably not more than 4 carbon atoms.
- the preferred method of carrying out the reduction is by reacting the carboxylic acid, salt, or ester with a complex metal hydride followed by or accompanied by hydrolysis of the product.
- Suitable complex metal hydrides are lithium aluminum hydride, lithium aluminum hydride-aluminum chloride, sodium borohydride-aluminum chloride, and sodium bis (2-methoxyethoxy)aluminohydride.
- a lower alkyl ester is the starting material, it is also satisfactory to carry out the reduction with sodium borohydride or to use a non-hydride reducing agent such as sodium in ethanol.
- the preferred reducing agent is lithium aluminum hydride followed by hydrolysis of the product.
- Preferred solvents for use with most of the complex metal hydrides named above are ethereal solvents such as diethyl ether, tetrahydrofuran, 1,2-dimethoxyethane, and diethylene glycol dimethyl ether.
- ethereal solvents such as diethyl ether, tetrahydrofuran, 1,2-dimethoxyethane, and diethylene glycol dimethyl ether.
- preferred solvents are water, dioxane, lower alkanols such as ethanol, and mixtures thereof.
- the required ratio of reactants depends on the particular starting materials used. For example, reduction with lithium aluminum hydride requires three-quarters of a mole of lithium aluminum hydride for each mole of carboxylic acid or one-half mole of lithium aluminum hydride for each mole of carboxylic acid ester.
- reaction time with lithium aluminum hydride is from 1 to 20 hours, optimally about 3 hours; and with sodium borohydride from 17 to 30 hours, optimally about 22 hours.
- reaction time with a complex metal hydride in a non-aqueous solvent is from 1 to 20 hours, optimally about 3 hours; and with sodium borohydride from 17 to 30 hours, optimally about 22 hours.
- the mixture is hydrolyzed with water or other aqueous medium and the product isolated. In other cases, the product can be isolated directly.
- the 2,2 dimethyl S-aryloxyvaleric acids, salts, and esters employed as starting materials in the foregoing process can be prepared by any of a variety of methods.
- an alkali metal derivative of a compound of the formula oH3-bHC0oR is reacted with an aryloxypropyl halide of the formula Ra R2 I OH:
- R R and R are as defined before and X represents halogen, preferably chlorine or bromine.
- the alkali metal derivative indicated above can be regarded as corresponding to the formula where M represents an alkali metal and R represents a salt-forming cation or a lower alkyl radical. It is customarily prepared in situ by reacting isobutyric acid or a salt or ester of isobutyric acid with a strong base such as lithium diisopropylamide. The reaction is preferably carried out in an anhydrous ethereal solvent followed by hydrolyzing the mixture with water. When it is desired to isolate the product as an ester, prolonged exposure to the basic aqueous medium is avoided.
- the lower alkyl ethers of the invention that is, the compounds wherein Y represents and R represents lower alkyl; can be produced by reacting a compound of the formula where R represents an alkyl radical of preferably not more than 4 carbon atoms.
- R represents an alkyl radical of preferably not more than 4 carbon atoms.
- esters are methyl iodide, ethyl bromide, ethyl iodide, isopropyl bromide, butyl chloride, butyl iodide, dimethyl sulfate, and methyl p-toluenesulfonate.
- bases suit able for use in the reaction are sodium hydride, sodium amide, n-butyllithium, phenyllithium, and other strong bases of alkali metals.
- a preferred base is n.-butyllithiurn.
- solvents suitable for use in the reaction are diethyl ether, diethylene glycol dimethyl ether, dimethoxyethane, tetrahydrofuran, dimethylformamide, dimethyl sulfoxide, hexamethylphosphoramide, or an excess of the lower alkylating agent.
- a preferred solvent is dimethoxyethane.
- the reactants can be employed in approximately equimolar quantities, it is preferred to use an excess of the lower alkylating agent.
- the time and temperature of the reaction are not critical and depend somewhat on the reactants employed. In general, the reaction is carried out at a temperature from to 150 C. or the reflux temperature of the solvent for from 2 to 48 hours. Using n-butyllithium as the base, the reaction is preferably carried out at a temperature of 0-35 C. for from 6 to 36 hours.
- esters of the invention that is, the compounds wherein Y represents -CH ()R and R represents an acyl radical of a hydrocarbon carboxylic acid containing not more than 7 carbon atoms, or
- phenylcarbamoyl can be produced by reacting a compound of the formula with a carboxylic acid of the formula Ac-OH, or a reactive derivative thereof, or phenyl isocyanate,
- a suitable catalyst is p-toluenesulfonic acid or other strong acid.
- a suitable catalyst is a tertiary amine such as triethylamine of pyridine.
- the time and temperature of the reaction are dependent on the specific starting materials used, In general, the reaction is carried out between room temperature and 175 C. or the reflux temperature of the solvent for from 1 to 96 hours, the longer reaction times being used at the lower temperatures. The preferred temperature range is from 95 to 125 C.
- one of the ractants is a hydrocarbon carboxylic acid, the progress of the reaction is conveniently followed by collecting the water formed in the reaction and continuing the reaction until the calculated amount of water has been collected.
- the nitriles of the invention can be produced by reacting a 3-aryloxypropyl halide of the formula AH. with isobutyronitrile in the presence of a base, where R and R are as defined before and X represents halogen.
- suitable bases are alkali metal hydrides, alkali metal amides, alkali metal tertiary alkoxides, and alkali metal triphenylmethides.
- Preferred bases are lithium tertiary amides, especially lithium diethylamide or lithium diisopropylamide.
- suitable solvents for the reaction are polar oxygenated solvents such as tetrahydrofuran, tetrahydropyran, dimethoxymethane, dimethoxyethane, diethylene glycol dimethyl ether, and dimethyl sulfoxide.
- Tetrahydrofuran is a preferred solvent for operating at lower temperatures and diethylene glycol dimethyl ether is a preferred solvent for operating at higher temperatures.
- the reactants can be used in approximately equimolar quantities, especially when the base is a lithium where R and R are as defined before and Ac represents the acyl radical of a hydrocarbon carboxylic acid containing not more than 7 carbon atoms.
- suitable reactive derivatives of the hydrocarbon carboxylic acids are the acid halides and the acid anhydrides.
- the reaction can be carried out in the absence of an added solvent although, in general, the use of a solvent is preferred.
- suitable solvents are tertiary amines, tertiary amides, ethers, aromatic hydrocarbons, halogenated hydrocarbons, ethyl acetate, or an excess of acid antertiary amide.
- an excess of the 3-aryl0xypropyl halide is preferred.
- the reaction can be carried out over a wide range of conditions, for example at a temperature from -50 to 175 C. for from 1 hour to 130 hours. According to the preferred conditions, the reaction is carried out with a lithium tertiary amide at 0 to 30 C. for from 4 to 24 hours.
- the aldehydes of the invention that is, the compounds wherein Y represents formyl, can be produced by reacting a compound of the formula CH3 H;
- R and R are as defined before and R" represents a hydrocarbon radical or substituted hydrocarbon radical of not more than 10 carbon atoms.
- hydrocarbon radicals which R can represent are methyl, ethyl, isopropyl, butyl, tertiary butyl, hexyl, decyl, cyclopentyl, cyclohexyl, and methylcyclohexyl.
- R represents a substituted hydrocarbon hydride reactant.
- preferred solvents are radical the nature and number of substituents are unimportant as the group R is lost during the course of the reaction.
- Preferred examples of R are cyclohexyl and tertiary butyl.
- hydrolytic agents are water, aqueous solutions of mineral acids such as hydrochloric acid, phosphoric acid, or sulfuric acid, and aqueous solutions of organic acids such as acetic acid and p-toluenesulfonic acid.
- an organic solvent such as tetrahydrofuran, a lower alkanol, or a lower alkanone can also be present.
- a preferred hydrolytic agent is aqueous hydrochloric acid optionally in the presence of tetrahydrofuran or other organic solvent. At least the calculated amount and preferably a large excess of the hydrolytic agent is used.
- the time and temperature of the reaction are not especially critical. In general, the reaction is carried out at a temperature from to 125 C. or the reflux temperature for from 1 hour to 24 hours, the longer reaction times being used at the lower temperatures. At a temperature of about 100 C. with dilute hydrochloric acid, the reaction is normally substantially complete within less than 4 hours.
- the preparation of this starting material can be carried out in situ and the reaction with the hydrolytic agent can be carried out directly by treatment of the reaction mixture with, for eX- ample, dilute hydrochloric acid or other hydrolytic agent.
- the compounds of the invention can exist in anhydrous form as well as in solvated, including hydrated, forms.
- the hydrated forms and the solvated forms with pharmaceutically-acceptable solvents are equivalent to the anhydrous or unsolvated form for the purposes of the invention.
- the compounds of the invention are new chemical substances, of value as pharmacological agents which reduce serum triglyceride levels.
- An important property of these compounds is that they reduce serum triglyceride levels without causing a corresponding reduction in serum cholesterol levels.
- the effectiveness of the compounds of the invention in lowering serum triglycerides can be demonstrated by standard methods. For example, male rats weighing 200-250 g. are maintained on a normal pellet diet. Each animal in a treatment group is given a daily oral dose of a test compound for 7 days. Commonly a test compound is first studied at a daily dose of 250 mg./ kg. body weight; in subsequent groups of rats, the dose is progressively lowered until the compound no longer exhibits significant activity. An untreated control group is also maintained.
- the animals are weighed and sacrificed, and the serum cholesterol and serum triglycerides are determined from blood samples taken from the vena cava.
- the methods used are described in Journal of Laboratory and Clinical Medicine, 50, 318 (1957) and Journal of Laboratory and Clinical Medicine, 50, 152 (1957).
- the test compound is considered to exhibit a side effect if the weight of the animals in the treatment group is significantly less than the weight of the animals in the control group.
- the following compounds of the invention at the indicated daily dose levels for 7 days produced the indicated reduction of serum triglycerides with no effect on serum cholesterol or weight of the animals relative to the untreated control group.
- EXAMPLE 2 With stirring at 0 C., 42 ml. of a 1.6 M solution of nbutyllithium in hexane is added to a solution of 15.8 g. of 2,2-dimethyl-5-(2,5-xylyloxy)-1-pentanol in 250 ml. of dry dimethoxyethane. After an additional 15 minutes stirring at 0 C., 28.5 g. of methyl iodide is added. The mixture is stirred for 18 hours at room temperature. An additional 28.5 g. of methyl iodide is added and the mixture is stirred for 20 hours more. It is then diluted with 250 ml. of water.
- the organic phase is separated, combined with an ether extract of the aqueous phase, dried over anhydrous magnesium sulfate, and filtered.
- the filtrate is concentrated under reduced pressure to give a residue of lmethoxy-2,2-dimethyl 5 (2,5-xylyloxy)pentane.
- the product is distilled in vacuo; b.p. 103- 104 C. at 60 microns; 11, 1.4537.
- EXAMPLE 3 A mixture of 15.0 g. of 2,2-dimethyl-5-(2,5-xylyloxy)- l-pentanol and 33.1 g. of acetic anhydride is heated at reflux for 2 hours, cooled, and diluted with 200 ml. of water. The mixture is stirred for 2 hours and extracted with 200 ml. of hexane. The organic phase is separated and washed with water, with saturated aqueous soditun bicarbonate, and with water, dried over anhydrous magnesium sulfate, and filtered. The filtrate is concentrated under reduced pressure to give a residue of 2,2-dimethyl- 5-(2,5-xylyloxy)-1-pentanol, acetate ester. For purification, the product is distilled in vacuo; b.p. -127 C at 90 microns; 12 1.4891.
- EXAMPLE 4 A mixture of 23.6 g. of 2,2-dimethyl-5-(2,5-xylyloxy)- l-pentanol, 12.8 g. of cyclohexanecarboxylic acid, 1.5 g.
- EXAMPLE 5 A mixture of 15.0 g. of 2,2-dimethyl-5-(3,5-xylyloxy)- 1-pentanol, 7.8 g. of benzoic acid, 1.0 g. of p-toluenesulfonic acid, and 200 ml. of toluene is heated at reflux for 62 hours with continuous removal of the water formed in the reaction. The mixture is cooled, diluted with 100 ml. of water, and washed with saturated aqueous sodium bicarbonate and with water. The organic phase is dried and concentrated in vacuo to give a residue of 2,2-dimethyl-S-(3,5-xylyloxy)-1-pentanol, benzoate ester; b.p. 168171 C. at 40 microns; 11 1.5321.
- EXAMPLE 7 With stirring and cooling at -10 C., 248 ml. of a 1.61 M solution of n-butyllithium in hexane is slowly added to a solution of 40.4 g. of diisopropylamine in 350 ml. of anhydrous tetrahydrofuran. The resulting mixture contains lithium diisopropylamide. After 10 minutes, 27.6 g. of isobutyronitrile is added and after an additional 15 minutes, 97.3 g. of 3-bromopropyl 2,5-xylyl ether (also known as 3-(2,5xylyloxy)propyl bromide) is added, the additions being made at such a rate that a temperature of 0-10" C.
- 3-bromopropyl 2,5-xylyl ether also known as 3-(2,5xylyloxy)propyl bromide
- EXAMPLE 8 With stirring and cooling at 010 C., 248 ml. of a 1.61 M solution of n-butyllithium in hexane is added toa solution of 40.4 g. of diisopropylamine in 350 ml. of anhydrous tetrahydrofuran. After minutes, 61.4 g. of N-(isobutylidene)cyclohexylamine is added and after an additional 15 minutes, 97.3 g. of 3-bromopropyl 2,5-xylyl ether (also known as 3-(2,5-xylyloxy)propyl bromide) is added, the additions being made at such a rate that a temperature of 0-10 C. is maintained.
- 3-bromopropyl 2,5-xylyl ether also known as 3-(2,5-xylyloxy)propyl bromide
- 3-(2,5xylyloxy)-propyl bromide also known as 3- bromopropyl 2,5-xylyl ether.
- it is stirred with 500 ml. of water and the aqueous phase is separated and acidified with 150 ml. of 6 N hydrochloric acid.
- the acidic mixture is extracted with ether and the ether extract is washed with saturated sodium chloride solution, dried over magnesium sulfate, concentrated almost to dryness, and distilled in vacuo.
- a distillate of 2,2-dimethyl-5-(2,5-xylyloxy)valeric acid is collected at b.p. 158-159 C. at 0.02 mm. of Hg; m.p. 6163 C. following crystallization from hexane.
- the same product is also obtained in the following manner.
- a mixture of 26.4 g. of isobutyric acid, 6.0 g. of magnesium oxide powder, and 25 0 ml. of toluene is stirred and heated at reflux with continuous removal of the water formed in the reaction.
- the resulting mixture containing magnesium isobutyrate is concentrated to one-half its original volume, cooled in an ice bath, and treated with 31.0 g. of diisopropylamine in 200 ml. of dry tetrahydrofuran and then with 179 ml. of 1.68 M n-butyllithium in heptane while the temperature is maintained below 10 C. After 15 more minutes, the mixture is warmed at 30 C.
Abstract
WHERE ONE OF R2 IS HYDROGEN; AND THE OTHER OF R2 AND R3 IS METHYL.
1-(H-CO-C(-CH3)2-(CH2)3-O-),2-R2,3-R3,5-(H3C-)-BENZENE
1. A COMPOUND OF THE FORMULA
1-(H-CO-C(-CH3)2-(CH2)3-O-),2-R2,3-R3,5-(H3C-)-BENZENE
1. A COMPOUND OF THE FORMULA
Description
United States PatentOfiice 3,847,994 Patented Nov. 12, 1974 US. Cl. 260-600 3 Claims ABSTRACT OF THE DISCLOSURE 2,2-dimethyl-5-(2,5-xy1yloxy)valeraldehyde and 2,2-dimethyl-5-(3,5-xylyloxy)valeraldehyde. These compounds lower serum triglyceride levels. They can be produced by reacting a substituted imine with a hydrolytic agent.
This is a division of application Ser. No. 24,000, filed Mar. 30, 1970, now Pat. No. 3,707,566.
SUMMARY AND DETAILED DESCRIPTION The present invention relates to new 2,2-dimethyl-5- aryloxypentane compounds. More particularly, the invention relates to new compounds of the formula and to methods for their production. In this formula one of R and R represents hydrogen; the other of R and R represents methyl; and Y represents cyano (CN), formyl (-CHO), or a group of the formula CH OR in which R represents hydrogen, lower alkyl, an acyl radical of a hydrocarbon carboxylic acid containing not more than 7 carbon atoms, or phenylcarbamoyl When R represents lower alkyl, it is a lower alkyl radical of preferably not more than 4 carbon atoms and is most suitably methyl.
In accordance with the invention, the carbinols of the invention, that is, the compounds wherein Y represents I CH2OR and R represents hydrogen, can be produced by reacting a compound of the formula with a reducing agent; where R and R are as defined before and R represents hydrogen, a salt-forming cation, or a lower alkyl radical of preferably not more than 4 carbon atoms. The preferred method of carrying out the reduction is by reacting the carboxylic acid, salt, or ester with a complex metal hydride followed by or accompanied by hydrolysis of the product. Some examples of suitable complex metal hydrides are lithium aluminum hydride, lithium aluminum hydride-aluminum chloride, sodium borohydride-aluminum chloride, and sodium bis (2-methoxyethoxy)aluminohydride. In the case where a lower alkyl ester is the starting material, it is also satisfactory to carry out the reduction with sodium borohydride or to use a non-hydride reducing agent such as sodium in ethanol. The preferred reducing agent is lithium aluminum hydride followed by hydrolysis of the product.
Preferred solvents for use with most of the complex metal hydrides named above, are ethereal solvents such as diethyl ether, tetrahydrofuran, 1,2-dimethoxyethane, and diethylene glycol dimethyl ether. However, in the case of sodium borohydride, preferred solvents are water, dioxane, lower alkanols such as ethanol, and mixtures thereof. The required ratio of reactants depends on the particular starting materials used. For example, reduction with lithium aluminum hydride requires three-quarters of a mole of lithium aluminum hydride for each mole of carboxylic acid or one-half mole of lithium aluminum hydride for each mole of carboxylic acid ester. However, these calculated ratios are not normally employed as it is preferred to use a relatively large excess of the lithium aluminum hydride or other reducing agent. Thus, it is customary to use up to two moles of lithium aluminum hydride to reduce one mole of carboxylic acid or up to ten moles of sodium borohydride to reduce one mole of carboxylic acid ester. The time and temperature of the reaction are not particularly critical and likewise are dependent on the specific reactants employed. In general, the reaction is carried out at a temperature between 0 C. and 120 C. or the reflux temperature of the solvent, with lithium aluminum hydride reductions preferably carried out at about 35-65" C. and sodium borohydride reductions preferably carried out at about C. The usual reaction time with lithium aluminum hydride is from 1 to 20 hours, optimally about 3 hours; and with sodium borohydride from 17 to 30 hours, optimally about 22 hours. Following reaction with a complex metal hydride in a non-aqueous solvent, the mixture is hydrolyzed with water or other aqueous medium and the product isolated. In other cases, the product can be isolated directly.
The 2,2 dimethyl S-aryloxyvaleric acids, salts, and esters employed as starting materials in the foregoing process can be prepared by any of a variety of methods. For example, an alkali metal derivative of a compound of the formula oH3-bHC0oR is reacted with an aryloxypropyl halide of the formula Ra R2 I OH:
where R R and R are as defined before and X represents halogen, preferably chlorine or bromine. The alkali metal derivative indicated above can be regarded as corresponding to the formula where M represents an alkali metal and R represents a salt-forming cation or a lower alkyl radical. It is customarily prepared in situ by reacting isobutyric acid or a salt or ester of isobutyric acid with a strong base such as lithium diisopropylamide. The reaction is preferably carried out in an anhydrous ethereal solvent followed by hydrolyzing the mixture with water. When it is desired to isolate the product as an ester, prolonged exposure to the basic aqueous medium is avoided. In other cases, the product is isolated directly as a salt or, following acidification, as the free acid. These procedures are illustrated in greater detail hereinafter and in a co-pending application of Paul L. Creger, Ser. No. 819,126, filed Apr. 24, 1969, now US. Pat. No. 3,674,836, issued July 4, 1972.
Also in accordance with the invention, the lower alkyl ethers of the invention, that is, the compounds wherein Y represents and R represents lower alkyl; can be produced by reacting a compound of the formula where R represents an alkyl radical of preferably not more than 4 carbon atoms. Some examples of such esters are methyl iodide, ethyl bromide, ethyl iodide, isopropyl bromide, butyl chloride, butyl iodide, dimethyl sulfate, and methyl p-toluenesulfonate. Some examples of bases suit able for use in the reaction are sodium hydride, sodium amide, n-butyllithium, phenyllithium, and other strong bases of alkali metals. A preferred base is n.-butyllithiurn. Some examples of solvents suitable for use in the reaction are diethyl ether, diethylene glycol dimethyl ether, dimethoxyethane, tetrahydrofuran, dimethylformamide, dimethyl sulfoxide, hexamethylphosphoramide, or an excess of the lower alkylating agent. A preferred solvent is dimethoxyethane. Although the reactants can be employed in approximately equimolar quantities, it is preferred to use an excess of the lower alkylating agent. The time and temperature of the reaction are not critical and depend somewhat on the reactants employed. In general, the reaction is carried out at a temperature from to 150 C. or the reflux temperature of the solvent for from 2 to 48 hours. Using n-butyllithium as the base, the reaction is preferably carried out at a temperature of 0-35 C. for from 6 to 36 hours.
Further in accordance with the invention the esters of the invention, that is, the compounds wherein Y represents -CH ()R and R represents an acyl radical of a hydrocarbon carboxylic acid containing not more than 7 carbon atoms, or
phenylcarbamoyl; can be produced by reacting a compound of the formula with a carboxylic acid of the formula Ac-OH, or a reactive derivative thereof, or phenyl isocyanate,
actant, a suitable catalyst is p-toluenesulfonic acid or other strong acid. When an acid halide or acid anhydride is a reactant, a suitable catalyst is a tertiary amine such as triethylamine of pyridine. The time and temperature of the reaction are dependent on the specific starting materials used, In general, the reaction is carried out between room temperature and 175 C. or the reflux temperature of the solvent for from 1 to 96 hours, the longer reaction times being used at the lower temperatures. The preferred temperature range is from 95 to 125 C. When one of the ractants is a hydrocarbon carboxylic acid, the progress of the reaction is conveniently followed by collecting the water formed in the reaction and continuing the reaction until the calculated amount of water has been collected.
Still further in accordance with the invention, the nitriles of the invention, that is, the compounds wherein Y represents cyano, can be produced by reacting a 3-aryloxypropyl halide of the formula AH. with isobutyronitrile in the presence of a base, where R and R are as defined before and X represents halogen. Some examples of suitable bases are alkali metal hydrides, alkali metal amides, alkali metal tertiary alkoxides, and alkali metal triphenylmethides. Preferred bases are lithium tertiary amides, especially lithium diethylamide or lithium diisopropylamide. Some examples of suitable solvents for the reaction are polar oxygenated solvents such as tetrahydrofuran, tetrahydropyran, dimethoxymethane, dimethoxyethane, diethylene glycol dimethyl ether, and dimethyl sulfoxide. Tetrahydrofuran is a preferred solvent for operating at lower temperatures and diethylene glycol dimethyl ether is a preferred solvent for operating at higher temperatures. The reactants can be used in approximately equimolar quantities, especially when the base is a lithium where R and R are as defined before and Ac represents the acyl radical of a hydrocarbon carboxylic acid containing not more than 7 carbon atoms. Some examples of suitable reactive derivatives of the hydrocarbon carboxylic acids are the acid halides and the acid anhydrides. The reaction can be carried out in the absence of an added solvent although, in general, the use of a solvent is preferred. Some examples of suitable solvents are tertiary amines, tertiary amides, ethers, aromatic hydrocarbons, halogenated hydrocarbons, ethyl acetate, or an excess of acid antertiary amide. When using other bases such as sodium hydride, an excess of the 3-aryl0xypropyl halide is preferred. Depending on the specific reactants employed, the reaction can be carried out over a wide range of conditions, for example at a temperature from -50 to 175 C. for from 1 hour to 130 hours. According to the preferred conditions, the reaction is carried out with a lithium tertiary amide at 0 to 30 C. for from 4 to 24 hours.
Yet further in accordance with the invention, the aldehydes of the invention, that is, the compounds wherein Y represents formyl, can be produced by reacting a compound of the formula CH3 H;
with a hydrolytic agent; where R and R are as defined before and R" represents a hydrocarbon radical or substituted hydrocarbon radical of not more than 10 carbon atoms. Some examples of hydrocarbon radicals which R can represent are methyl, ethyl, isopropyl, butyl, tertiary butyl, hexyl, decyl, cyclopentyl, cyclohexyl, and methylcyclohexyl. Where R represents a substituted hydrocarbon hydride reactant. Some examples of preferred solvents are radical the nature and number of substituents are unimportant as the group R is lost during the course of the reaction. Preferred examples of R are cyclohexyl and tertiary butyl. Some examples of suitable hydrolytic agents are water, aqueous solutions of mineral acids such as hydrochloric acid, phosphoric acid, or sulfuric acid, and aqueous solutions of organic acids such as acetic acid and p-toluenesulfonic acid. If desired, an organic solvent such as tetrahydrofuran, a lower alkanol, or a lower alkanone can also be present. A preferred hydrolytic agent is aqueous hydrochloric acid optionally in the presence of tetrahydrofuran or other organic solvent. At least the calculated amount and preferably a large excess of the hydrolytic agent is used. The time and temperature of the reaction are not especially critical. In general, the reaction is carried out at a temperature from to 125 C. or the reflux temperature for from 1 hour to 24 hours, the longer reaction times being used at the lower temperatures. At a temperature of about 100 C. with dilute hydrochloric acid, the reaction is normally substantially complete within less than 4 hours.
Starting materials required for use in the foregoing process can be prepared in any of a number of ways. For example, an imine of the formula OH-CH=NR7 is reacted with a 3-aryloxypropyl halide of the formula OCHaCH1CHg-X I CH3 in the presence of lithium diisopropylamide to produce an imine employed as starting material in the process of the invention; where R R and R are as defined before, and X represents halogen. If desired, the preparation of this starting material can be carried out in situ and the reaction with the hydrolytic agent can be carried out directly by treatment of the reaction mixture with, for eX- ample, dilute hydrochloric acid or other hydrolytic agent.
The compounds of the invention can exist in anhydrous form as well as in solvated, including hydrated, forms. In general, the hydrated forms and the solvated forms with pharmaceutically-acceptable solvents are equivalent to the anhydrous or unsolvated form for the purposes of the invention.
The compounds of the invention are new chemical substances, of value as pharmacological agents which reduce serum triglyceride levels. An important property of these compounds is that they reduce serum triglyceride levels without causing a corresponding reduction in serum cholesterol levels. The effectiveness of the compounds of the invention in lowering serum triglycerides can be demonstrated by standard methods. For example, male rats weighing 200-250 g. are maintained on a normal pellet diet. Each animal in a treatment group is given a daily oral dose of a test compound for 7 days. Commonly a test compound is first studied at a daily dose of 250 mg./ kg. body weight; in subsequent groups of rats, the dose is progressively lowered until the compound no longer exhibits significant activity. An untreated control group is also maintained. At the end of the 7-day test period the animals are weighed and sacrificed, and the serum cholesterol and serum triglycerides are determined from blood samples taken from the vena cava. The methods used are described in Journal of Laboratory and Clinical Medicine, 50, 318 (1957) and Journal of Laboratory and Clinical Medicine, 50, 152 (1957). The test compound is considered to exhibit a side effect if the weight of the animals in the treatment group is significantly less than the weight of the animals in the control group. In representative determinations, the following compounds of the invention at the indicated daily dose levels for 7 days produced the indicated reduction of serum triglycerides with no effect on serum cholesterol or weight of the animals relative to the untreated control group. 2,2-dimethyl--(2,5-xylyloxy)-lpentanol, 10 mg./kg. per day, 38% reduction of serum triglycerides; 2,2-dimethyl 5 (3,5-xylyloxy)-1-pentanol, 75 mg./ kg. per day, 64% reduction of serum triglycerides; 2,2-dimethyl-5-(2,5-xylyloxy)valeronitrile, 250 mg./kg. per day, 39% reduction of serum triglycerides. Other compounds of the invention produce a significant reduction of serum triglycerides within the dosage range indicated above. Some of the preferred compounds of the invention are the carbinols mentioned above. In addition to administration by the oral route, as described above, the compounds of the invention can also be given by the parenteral route if desired.
The invention is illustrated by the following examples.
EXAMPLE 1 With stirring, a solution of 25.0 g. of 2,2-dimethyl-5- (2,5-xylyloxy)valeric acid in 50 ml. of ether is slowly added to a mixture of 4.5 g. of lithium aluminum hydride and 300 ml. of ether. The resulting mixture is heated at refiux for 3 hours, cooled, and treated successively with 5 ml. of water, 5 ml. of 15% sodium hydroxide solution, and 10 ml. of water. Insoluble inorganic material is removed by filtration. The filtrate is evaporated under reduced pressure to give a residue of 2,2-dimethyl-5-(2,5- xylyloxy)-1-pentanol. For purification, the product is distilled in vacuo; b,p. 1l7 C. at 20 microns; n 1.5088.
By the foregoing procedure, with the substitution of 25 .0 g. of 2,2-dimethyl-5-(3,5-xylyloxy)valeric acid for the 2,2- dimethyl-5-(2,5-xylyloxy)va1eric acid, the product is 2,2- dimethyl-5-(3,5-xylyloxy)-1-pentanol; b.p. 117-118 C. at 70 microns; n 1.5086.
EXAMPLE 2 With stirring at 0 C., 42 ml. of a 1.6 M solution of nbutyllithium in hexane is added to a solution of 15.8 g. of 2,2-dimethyl-5-(2,5-xylyloxy)-1-pentanol in 250 ml. of dry dimethoxyethane. After an additional 15 minutes stirring at 0 C., 28.5 g. of methyl iodide is added. The mixture is stirred for 18 hours at room temperature. An additional 28.5 g. of methyl iodide is added and the mixture is stirred for 20 hours more. It is then diluted with 250 ml. of water. The organic phase is separated, combined with an ether extract of the aqueous phase, dried over anhydrous magnesium sulfate, and filtered. The filtrate is concentrated under reduced pressure to give a residue of lmethoxy-2,2-dimethyl 5 (2,5-xylyloxy)pentane. For purification, the product is distilled in vacuo; b.p. 103- 104 C. at 60 microns; 11, 1.4537.
By the foregoing procedure, with the substitution of 15.8 g. of 2,2-dimethyl-5-(3,5-xylyloxy)-l-pentanol for the 2,2-dimethyl-5-(2,5-xylyloxy)-1-pentanol, the product is l-methoxy 2,2 dimethyl-S-(3,5-xylyloxy)pentane; b.p. 108109 C. at 70 microns; n 1.4956.
EXAMPLE 3 A mixture of 15.0 g. of 2,2-dimethyl-5-(2,5-xylyloxy)- l-pentanol and 33.1 g. of acetic anhydride is heated at reflux for 2 hours, cooled, and diluted with 200 ml. of water. The mixture is stirred for 2 hours and extracted with 200 ml. of hexane. The organic phase is separated and washed with water, with saturated aqueous soditun bicarbonate, and with water, dried over anhydrous magnesium sulfate, and filtered. The filtrate is concentrated under reduced pressure to give a residue of 2,2-dimethyl- 5-(2,5-xylyloxy)-1-pentanol, acetate ester. For purification, the product is distilled in vacuo; b.p. -127 C at 90 microns; 12 1.4891.
By the foregoing procedure, with the substitution of 15.0 g. of 2,2-dimethyl-5-(3,5-xylyloxy)-l-pentanol for the 2,2-dimethyl-5-(2,5-xylyloxy)-1-pentanol, the product is 2,2-dimethyl-5-(3,5-xylyloxy)-1-pentanol, acetate ester; b.p. 125-136 C. at 50 microns.
EXAMPLE 4 A mixture of 23.6 g. of 2,2-dimethyl-5-(2,5-xylyloxy)- l-pentanol, 12.8 g. of cyclohexanecarboxylic acid, 1.5 g.
of p-toluenesulfonic acid monohydrate, and 250 ml. of toluene is heated at reflux for 18 hours with continuous removal of the water formed in the reaction. The mixture is cooled, diluted with 100 ml. of ether, washed with two 50 ml. portions of 2 N sodium hydroxide and with 100 ml. of saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and filtered. The filtrate is concentrated in vacuo to give a residue of cyclohexanecarboxylic acid, 2,2-dimethyl-5-(2,5-xylyloxy)pentyl ester. For purification, the product is distilled in vacuo; b.p. 160162 C. at 7 microns; 11 1.5007.
EXAMPLE 5 A mixture of 15.0 g. of 2,2-dimethyl-5-(3,5-xylyloxy)- 1-pentanol, 7.8 g. of benzoic acid, 1.0 g. of p-toluenesulfonic acid, and 200 ml. of toluene is heated at reflux for 62 hours with continuous removal of the water formed in the reaction. The mixture is cooled, diluted with 100 ml. of water, and washed with saturated aqueous sodium bicarbonate and with water. The organic phase is dried and concentrated in vacuo to give a residue of 2,2-dimethyl-S-(3,5-xylyloxy)-1-pentanol, benzoate ester; b.p. 168171 C. at 40 microns; 11 1.5321.
EXAMPLE 6 A solution of 12.3 g. of 2,2-dimethyl-5-(2,5-xylyloxy)- l-pentanol, 6.21 g. of phenyl isocyanate, and 200 ml. of toluene is heated at reflux for 62 hours. The mixture is concentrated under reduced pressure to give a residue of 2,2 dimethyl-S-(2,5-xylyloxy)-1-pentanol, carbanilate ester. For purification, the product is distilled in vacuo; b.p. 187201 C. at 70 microns; 11 1.5390; mp. 6062 C.
EXAMPLE 7 With stirring and cooling at -10 C., 248 ml. of a 1.61 M solution of n-butyllithium in hexane is slowly added to a solution of 40.4 g. of diisopropylamine in 350 ml. of anhydrous tetrahydrofuran. The resulting mixture contains lithium diisopropylamide. After 10 minutes, 27.6 g. of isobutyronitrile is added and after an additional 15 minutes, 97.3 g. of 3-bromopropyl 2,5-xylyl ether (also known as 3-(2,5xylyloxy)propyl bromide) is added, the additions being made at such a rate that a temperature of 0-10" C. is maintained. The resulting mixture is stirred at 30 C. for 18 hours and then diluted with 250 ml. of water. The organic phase is separated, dried over anhydrous magnesium sulfate, and filtered. The filtrate is concentrated under reduced pressure to give a residue of 2,2-dimethyl--(2,5-xylyloxy)valeronitrile. For purification, the product is distilled in vacuo; b.p. 114l20 C. at 60 microns; 14 1.4975.
By the foregoing procedure, with the substitution of 97.3 g. of 3-bromopropyl 3,5-xylyl ether (also known as 3-(3,5-xylyloxy)propyl bromide) for the 3-brornopropyl 2,5-xylyl ether, the product is 2,2-dimethyl-5-(3,5- xylyloxy)valeronitrile; b.p. 115120 C. at 50 microns; n 1.5005.
EXAMPLE 8 With stirring and cooling at 010 C., 248 ml. of a 1.61 M solution of n-butyllithium in hexane is added toa solution of 40.4 g. of diisopropylamine in 350 ml. of anhydrous tetrahydrofuran. After minutes, 61.4 g. of N-(isobutylidene)cyclohexylamine is added and after an additional 15 minutes, 97.3 g. of 3-bromopropyl 2,5-xylyl ether (also known as 3-(2,5-xylyloxy)propyl bromide) is added, the additions being made at such a rate that a temperature of 0-10 C. is maintained. The resulting mixture is stirred at 30 C. for 18 hours. The mixture, which now contains N-[2,2-dimethyl-5-(2,5-xylyloxy)pentylidene]cyclohexylamine is heated at reflux for 4 hours with 300 ml. of 3 N hydrochloric acid. It is then cooled and extracted with ether. The ether extract is washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and filtered. The filtrate is concentrated under reduced pressure to give a residue of 2,2- dimethyl-S-(2,5-xylyloxy)valeraldehyde. For purification, the product is distilled in vacuo; b.p. 98-104 C. at 30 microns.
By the foregoing procedure, with the substitution of 97.3 g. of 3-bromopropyl 3,5-xylyl ether (also known as 3-(3,5-xylyloxy)propyl bromide) for the 3-bromopropyl 2,5-xylyl ether, the product is 2,2-dimethyl-5-(3,5-xylyloxy)valeraldehyde; b.p. 100l03 C. at 20 microns; 11 1.5020.
STARTING MATERIALS With stirring, 44.1 g. of isobutyric acid is added to a mixture of 51.0 g. of diisopropylamine, 23.2 g. of a 57% sodium hydride dispersion in mineral oil, and 350 ml. of tetrahydrofuran. When gas evolution subsides, the mixture is heated at reflux for 15 minutes, cooled to 0 C., and treated with 345 ml. of a 1.45 M solution of n-butyllithium in heptane. After 5 hours, the mixture is warmed one-half hour at 30 C., cooled to 0 C., and treated with 122.0 g. of 3-(2,5xylyloxy)-propyl bromide (also known as 3- bromopropyl 2,5-xylyl ether). After one more hour, it is stirred with 500 ml. of water and the aqueous phase is separated and acidified with 150 ml. of 6 N hydrochloric acid. The acidic mixture is extracted with ether and the ether extract is washed with saturated sodium chloride solution, dried over magnesium sulfate, concentrated almost to dryness, and distilled in vacuo. A distillate of 2,2-dimethyl-5-(2,5-xylyloxy)valeric acid is collected at b.p. 158-159 C. at 0.02 mm. of Hg; m.p. 6163 C. following crystallization from hexane.
The same product is also obtained in the following manof lithium hydride for the sodium hydride in the above procedure.
The same product is also obtained in the following manner. A mixture of 26.4 g. of isobutyric acid, 6.0 g. of magnesium oxide powder, and 25 0 ml. of toluene is stirred and heated at reflux with continuous removal of the water formed in the reaction. When water formation ceases, the resulting mixture containing magnesium isobutyrate is concentrated to one-half its original volume, cooled in an ice bath, and treated with 31.0 g. of diisopropylamine in 200 ml. of dry tetrahydrofuran and then with 179 ml. of 1.68 M n-butyllithium in heptane while the temperature is maintained below 10 C. After 15 more minutes, the mixture is warmed at 30 C. for one-half hour, cooled to 0-10 C., and treated with 75.0 g. of 3-(2,5-xylyloxy)- propyl bromide. The mixture is then stirred for 18 hours at room temperature and diluted with ml. of 6 N hydrochloric acid and 250 ml. of water. The organic phase is separated, concentrated, and the residue distilled in vacuo to give 2,2-dimethyl-5- (2,5-xylyloxy)valeric acid.
With stirring, 33.0 g. of dry sodium isobutyrate (prepared from isobutyric acid and sodium hydroxide) is added to a solution of 31.0 g. of diisopropylamine in 300 ml. of anhydrous tetrahydrofuran. With external cooling to maintain the temperature below 10 C., 217 ml. of a 1.45 M solution of n-butyllithiurn in heptane is added. The mixture is then stirred at 30 C. for one-half hour and treated with 75.0 g. of 3-(3,5-xylyloxy)propyl bromide (also known as 3-bromopropyl 3,5-xylyl ether) dissolved in tetrahydrofuran. After 15 minutes, the mixture is allowed to warm to room temperature and stirring is continued for 16 hours. The mixture is hydrolyzed with 500 ml. of water and the aqueous phase is separated, washed with 200 ml. of ether, and acidified with 6 N sulfuric acid to give 2,2-dimethyl-5-(3,5-xylyloxy)valeric acid as an insoluble product. For purification, the product is dissolved in ether and the ether solution is washed with water, dried over magnesium sulfate, and evaporated. The product is crystallized from hexane; mp. 9293 C.
9 What is claimed is: 1. A compound of the formula where one of R and R is hydrogen; and the other of R and R is methyl.
2. A compound according to Claim 1 which is 2,2-di- 1O References Cited UNITED STATES PATENTS 1/1968 Bolhofer 260-600 3/ 1950 Smith et a1. 260600 OTHER REFERENCES Hudak et a1.: Chem. Abs., vol. 55 (1961), 24517g.
HOWARD T. MARS, Primary Examiner N. CHAN, Assistant Examiner
Claims (1)
1. A COMPOUND OF THE FORMULA
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US00283864A US3847994A (en) | 1970-03-30 | 1972-08-25 | 2,2-dimethyl-5-(aryloxy)-valeraldehydes |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4134879A (en) * | 1974-01-21 | 1979-01-16 | Ciba-Geigy Corporation | Thioether-containing phenolic antioxidant stabilized polymers |
EP0155973A1 (en) * | 1982-04-06 | 1985-10-02 | INTERNATIONAL FLAVORS & FRAGRANCES INC. | Hydrocarbyloxy alkanals, organoleptic uses thereof and processors for preparing same |
US5155260A (en) * | 1990-05-11 | 1992-10-13 | Egis Gyogyszergyar | Process for the preparation of 2,2-dimethyl-5-(2,5-dimethyl-phenoxy)-pentanoic acid, intermediates for preparing this compound and process for preparing the intermediates |
US5235097A (en) * | 1990-05-11 | 1993-08-10 | Egis Gyogyszergyar | Process for the preparation of 2,2-dimethyl-5-(2,5-dimethyl-phenoxy)-pentanoic acid, intermediates for preparing this compound and process for preparing the intermediates |
WO2020038464A1 (en) * | 2018-08-23 | 2020-02-27 | 北京厚燊药德科技有限责任公司 | Fibric acid compound and medical use thereof |
-
1972
- 1972-08-25 US US00283864A patent/US3847994A/en not_active Expired - Lifetime
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4134879A (en) * | 1974-01-21 | 1979-01-16 | Ciba-Geigy Corporation | Thioether-containing phenolic antioxidant stabilized polymers |
EP0155973A1 (en) * | 1982-04-06 | 1985-10-02 | INTERNATIONAL FLAVORS & FRAGRANCES INC. | Hydrocarbyloxy alkanals, organoleptic uses thereof and processors for preparing same |
US5155260A (en) * | 1990-05-11 | 1992-10-13 | Egis Gyogyszergyar | Process for the preparation of 2,2-dimethyl-5-(2,5-dimethyl-phenoxy)-pentanoic acid, intermediates for preparing this compound and process for preparing the intermediates |
US5235097A (en) * | 1990-05-11 | 1993-08-10 | Egis Gyogyszergyar | Process for the preparation of 2,2-dimethyl-5-(2,5-dimethyl-phenoxy)-pentanoic acid, intermediates for preparing this compound and process for preparing the intermediates |
WO2020038464A1 (en) * | 2018-08-23 | 2020-02-27 | 北京厚燊药德科技有限责任公司 | Fibric acid compound and medical use thereof |
CN110857268A (en) * | 2018-08-23 | 2020-03-03 | 北京厚燊药德科技有限责任公司 | Phenoxy acid compound and medical application thereof |
AU2019324405B2 (en) * | 2018-08-23 | 2022-09-22 | Qingdao Rising Biotechnology Co., Ltd. | Phenoxy carboxylic acid compounds and medical uses thereof |
CN110857268B (en) * | 2018-08-23 | 2022-10-04 | 青岛睿森生物科技有限公司 | Phenoxy acid compound and medical application thereof |
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